be your own worst enemy

be (one's) own worst enemy

To do things that complicate one's life and/or keep one from success; to be self-destructive or self-sabotaging. Of course Tommy started skipping school again—he's his own worst enemy.She always sabotages a relationship when it's going really well because she's her own worst enemy.

be your ˌown worst ˈenemy

be a person who often creates problems or difficulties for himself/herself: He spends all his money on clothes, and then finds that he’s got nothing left to live on — if you ask me, he’s his own worst enemy.

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